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Number and Operations in Base 10: Rounding off Numbers CCSS 3.NBT.1 Facts & Worksheets

Rounding is a procedure for estimating. Rounding takes advantage of the number of numbers in a decade.

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Worksheets /Math /Grade 3 (ages 8-9) /Number and Operations in Base 10: Rounding off Numbers CCSS 3.NBT.1 Facts & Worksheets

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Number and Operations in Base 10 Rounding off Numbers CCSS 3.NBT.1 Worksheets
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Rounding is a procedure for estimating. Rounding takes advantage of the number of numbers in a decade.

See the fact file below for more information on the rounding off numbers or alternatively, you can download our 21-page Number and Operations in Base 10: Rounding off Numbers CCSS 3.NBT.1 worksheet pack to utilise within the classroom or home environment.

Key Facts & Information

LEARNING OBJECTIVE

  • At the end of the lesson, students will be able to use place value understanding to round whole numbers to the nearest 10 or 100.

A NOTE FOR THE TEACHER

  • When teaching rounding of numbers, ensure that the learner:
    • Understands how to round to the nearest 10 (for example, 254 rounds to 250).
    • Understands how to round to the nearest 100 (for example, 254 rounds to 300).
    • Able to explain how rounding and estimating are similar and different.
    • Determine when rounding or estimating is more useful.

THEORY

  • Rounding is a procedure for estimating. Rounding takes advantage of the number of numbers in a decade. There are 5 numbers that round to the same decade and five numbers that round to the next decade. For example, 40, 41, 42, 43, and 44 round to the same decade (40). 45, 46, 47, 48, and 49 round to the next decade (50).
    • Underline the digit, look next door.
    • If it’s 5 or greater, add one more.
    • If it’s less than 5, leave it for sure.
    • Everything after is a zero, not more.
  • Example: Round off 26 to the nearest ten.
  • We need to decide if the ten is going to remain the same or change to the next whole number. First, we need to establish, which is the ten in the number 26.
  • The ten in 26 is the 2, so we underline the 2.

  • Now we look next door to determine if the 2 will change or remain the same

  • If the number next door is 0,1,2,3,4, then the 2 will remain the same. If the number is 5,6,7,8,9, then the 2 will change to 3. Here the number is 6, so therefore the 26 will become 30.
  • Example: Round off 547 to the nearest hundred.The same rule applies. Identify the hundreds column and underline it.

  • The number next door is:

  • Therefore the 5 will remain the same and the answer is 500.

Number and Operations in Base 10: Rounding off Numbers CCSS 3.NBT.1 Worksheets

This is a fantastic bundle that includes everything you need to know about Number and Operations in Base 10: Rounding off Numbers across 21 in-depth pages. These are ready-to-use worksheets that align with the Common Core CCSS code3.NBT.1 for Number and Operations in Base 10: Rounding off Numbers.

Table of contents:

  • A lesson plan
  • Warm-up activity
  • Math theory explained
  • Assisted learning activities
  • Independent learning activities
  • Extension activities and games
  • Answer keys

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Use With Any Curriculum

These worksheets have been specifically designed for use with any international curriculum. You can use these worksheets as-is, or edit them using Google Slides to make them more specific to your own student ability levels and curriculum standards.

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